Electronic cigarette

ABSTRACT

An electronic cigarette includes a power supply device, a sensing unit, an atomizer, a liquid storage structure, a fluid transportation device, a casing and a mouthpiece. The atomizer includes an electric heater and a liquid receiving part. The electric heater surrounds the liquid receiving part. The liquid storage structure includes a passageway for allowing an airflow to go through and a liquid container. The electric heater is disposed on a first end of the passageway. A cigarette liquid is stored in the liquid container. The fluid transportation device includes an input channel and an output channel. The input channel is in communication with the liquid container. The output channel is in communication with the liquid receiving part. The cigarette liquid is transferred to the liquid receiving part at a certain amount. Consequently, an atomized vapor is generated. The casing has an entrance. The mouthpiece seals an end of the casing.

FIELD OF THE INVENTION

The present invention relates to an electronic cigarette, and more particularly to an electronic cigarette with a fluid transportation device.

BACKGROUND OF THE INVENTION

Nowadays, electronic cigarettes are widely used to replace the conventional tobacco cigarettes. FIG. 1A is a schematic cross-sectional view illustrating a conventional electronic cigarette. FIG. 1B is a schematic cross-sectional view illustrating the structure of an atomizer of the conventional electronic cigarette. As shown in FIGS. 1A and 1B, the electronic cigarette comprises a first casing 1 a, a second casing 1 b, a power supply device 2, a sensing unit 3, an atomizer 4 and a liquid storage structure 5. The first casing 1 a and the second casing 1 b are thin-wall metal pipes, e.g., stainless steel pipes. The power supply device 2, the sensing unit 3, the atomizer 4 and the liquid storage structure 5 are disposed within the first casing 1 a and the second casing 1 b. After the first casing 1 a and the second casing 1 b are combined together, the electronic cigarette is assembled. The length and diameter of the electronic cigarette are similar to those of the conventional tobacco cigarette. The power supply device 2 and the sensing unit 3 are disposed within the first casing 1 a. The first casing 1 a comprises at least one entrance 1 c near the sensing unit 3. The atomizer 4 and the liquid storage structure 5 are disposed within the second casing 1 b. The atomizer 4 is fixed and supported on a bracket 7. The atomizer 4 comprises an electric heater 41, a liquid receiving part 42 and a liquid transfer part 43. The liquid receiving part 42 is arranged around the electric heater 41. The liquid transfer part 43 is tightly contacted with the liquid receiving part 42. The electric heater 41 has a hollow structure. The liquid storage structure 5 comprises a passageway 51 and a liquid container 52. The passageway 51 is formed within the liquid storage structure 5 for allowing the gas to pass through. The liquid container 52 is arranged around the passageway 51. A communication part 431 of the liquid transfer part 43 is contacted with the liquid container 52. Consequently, a cigarette liquid in the liquid container 52 could be absorbed to or infiltrate to the liquid receiving part 42 through the communication part 431 of the liquid transfer part 43. Moreover, an intake-and-electric-connection element 10 is disposed between the atomizer 4 and the sensing unit 3 to define an airflow path. The airflow path is in communication with the passageway 51 of the liquid storage structure 5. After the ambient airflow is fed into the at least one entrance 1 c, the airflow is transferred to the passageway 51 of the liquid storage structure 5 through the sensing unit 3 and the electric heater 41. The electronic cigarette further comprises an electrode ring 8. The electrode ring 8 is electrically connected with two pins of the electric heater 41. Moreover, the electrode ring 8 is electrically connected with the power supply device 2 through the electric connection between the intake-and-electric-connection element 10 and the sensing unit 3. An electric circuit of the power supply device 2 is selectively enabled or disabled according to the result of sensing the airflow by the sensing unit 3. Moreover, a mouthpiece 9 is disposed on an end of the second casing 1 b and in communication with the passageway 51 of the liquid storage structure 5.

The operations of the electronic cigarette will be described as follows. As mentioned above, the cigarette liquid in the liquid container 52 can be absorbed to or infiltrate to the liquid receiving part 42 through the communication part 431 of the liquid transfer part 43. When the user smokes and inhales the air through the mouthpiece 9, the airflow flows through the electronic cigarette. According to the sensing result of the sensing unit 3, the electric circuit of the power supply device 2 is enabled. After the electric circuit of the power supply device 2 is enabled, the power supply device 2 provides electric power to the electrode ring 8. Consequently, the electric heater 41 is enabled to heat the cigarette liquid. Meanwhile, the cigarette liquid in the liquid receiving part 42 is heated and atomized by the electric heater 41. Consequently, the user inhales the atomized vapor from the passageway 51 of the liquid storage structure 5 through the mouthpiece 9. When the user stops smoking, the airflow does not flow through the electronic cigarette. According to the sensing result of the sensing unit 3, the electric circuit of the power supply device 2 is disabled. Meanwhile, the electric heater 41 stops heating the cigarette liquid.

As mentioned above, the cigarette liquid is transferred to the liquid receiving part 42 through the communication part 431 of the liquid transfer part 43. However, this design has some drawbacks. Since it is difficult to precisely control the amount of the cigarette liquid to be transferred to the liquid receiving part 42, the cigarette liquid usually fails to be transferred uniformly to the liquid receiving part 42. If a part of the liquid receiving part 42 receives a lesser amount of the cigarette liquid than the other parts, the liquid droplets are not uniformly generated so that an unpleasing burning taste appears in the atomized vapor.

In addition, since the amount of the cigarette liquid to be transferred to the liquid receiving part 42 cannot be precisely controlled, the liquid leakage occurs. Especially when the electronic cigarette stays in an upright position with the mouthpiece 9 on the top, the cigarette liquid continuously moves from the liquid container 52 to the liquid receiving part 42 under the force of gravity. Once the liquid receiving part 42 reaches a saturation state, the excessive cigarette liquid drops down to the bracket 7 and the intake-and-electric-connection element 10. Moreover, the cigarette liquid may drop down through the sensing unit 3 and leak out from the at least one entrance 1 c, which results in terrible user experience.

Moreover, there are some differences between the electronic cigarettes and the tobacco cigarettes. For example, when people smoke the tobacco cigarettes, they are accustomed to gulp air quickly and shortly. Whereas, people smoke the electronic cigarettes slowly and gently. While the tobacco user smokes and inhales a great amount of oxygen, the user can quickly get the wanted amount of smoke because the tobacco is burnt and atomized faster. However, while the user smokes the conventional electronic cigarette, the electric power transmitted to the electric heater cannot be adjusted. That is the heating speed of the electric heater cannot be adjusted. If the heating speed is too fast, the cigarette liquid is atomized by the atomizer very quickly. Since the cigarette liquid of the conventional electronic cigarette is provided according to a siphon effect, the speed of providing the cigarette liquid is too slow. Under this circumstance, the amount of the atomized vapor is insufficient or the atomizer is burnt out. Since the electric power transmitted to the atomizer of the conventional electronic cigarette is fixed, the user has to smoke the electronic cigarette slowly and gently to provide a sufficient heating time to the atomizer. That is, the conventional method of atomizing the cigarette liquid of the electronic cigarette still has some drawbacks. The above problems lead to significant differences between the tobacco cigarette and the electronic cigarette. Because of these drawbacks, the user does not prefer to choose the electronic cigarette in replace of the tobacco cigarette.

For solving the drawbacks of the conventional technologies, the present invention provides an improved electronic cigarette.

SUMMARY OF THE INVENTION

An object of the present invention provides an electronic cigarette. The cooperation of a fluid transportation device and a liquid receiving part of an atomizer forms a controllable switch element. The amount of the cigarette liquid to be transferred to the liquid receiving part of the atomizer is precisely controlled by the controllable switch element. Consequently, the taste of the atomized vapor is enhanced, and the liquid leakage problem is solved.

Another object of the present invention provides an electronic cigarette for allowing the user to inhale a great amount of atomized vapor quickly. The electronic cigarette includes an airflow sensor and an air pressure sensor. The air pressure sensor is operable to generate and transmit a detection signal to a control module according to the result of detecting a pressure of the airflow. According to the detection signal, the control module adjusts the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid. That is, the control signal from the control module is adjusted according to the detection signal. Since the driving frequency of the fluid transportation device and the driving power of the heater module are correspondingly changed according to the control signal, the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid are adjusted. Consequently, the user could inhale a great amount of atomized vapor quickly, or the user could inhale the same amount of atomized vapor in each breath.

In accordance with an aspect of the present invention, there is provided an electronic cigarette. The electronic cigarette includes a power supply device, a sensing unit, an atomizer, a liquid storage structure, a fluid transportation device, a casing and a mouthpiece. The power supply device provides a driving power and a control signal. An electric circuit of the power supply device is selectively enabled or disabled according to a result of detecting an airflow by the sensing unit. The atomizer includes an electric heater and at least one liquid receiving part. The electric heater surrounds the liquid receiving part. The liquid storage structure includes a passageway and a liquid container. The passageway allows the airflow to go through. The electric heater of the atomizer is disposed on a first end of the passageway. A cigarette liquid is stored in the liquid container. A fluid transportation device includes an input channel and an output channel. The input channel is in communication with the liquid container. The output channel is in communication with the liquid receiving part of the atomizer. The cigarette liquid is transferred from the liquid container to the liquid receiving part through the fluid transportation device, so that the cigarette liquid is transferred to the electric heater of the atomizer at a certain amount. After the cigarette liquid is heated by the electric heater, an atomized vapor is generated. The power supply device, the sensing unit, the fluid transportation device, the atomizer, the liquid storage structure and an intake-and-electric-connection element are disposed within the casing, and the casing has an entrance for the airflow to pass through. After the airflow is fed into the entrance, the airflow passes through the sensing unit and the passageway of the liquid storage structure along an airflow path. The fluid transportation device and the electric heater of the atomizer are electrically connected with the power supply device and the sensing unit through the intake-and-electric-connection element to receive the driving power and the control signal. The mouthpiece seals an end of the casing and in communication with the passageway of the liquid storage structure. The mouthpiece has an opening for inhaling the atomized vapor in the passageway of the liquid storage structure.

The above contents of the present invention will become more readily apparent to those ordinarily skilled in the art after reviewing the following detailed description and accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a schematic cross-sectional view illustrating the conventional electronic cigarette;

FIG. 1B is a schematic cross-sectional view illustrating the structure of an atomizer of the conventional electronic cigarette;

FIG. 2A is a schematic cross-sectional view illustrating an electronic cigarette according to an embodiment of the present invention;

FIG. 2B is a schematic cross-sectional view illustrating some components near the power supply device of the electronic cigarette according to the embodiment of the present invention;

FIG. 2C is a schematic cross-sectional view illustrating some components near the atomizer of the electronic cigarette according to the embodiment of the present invention;

FIG. 2D is a schematic top view illustrating the structure of an exemplary atomizer of the electronic cigarette according to the embodiment of the present invention;

FIG. 2E is a schematic top view illustrating the structure of another exemplary atomizer of the electronic cigarette according to the embodiment of the present invention;

FIG. 3 is a schematic functional block diagram illustrating the power supply device of the electronic cigarette according to the embodiment of the present invention;

FIG. 4 is a schematic perspective view illustrating the fluid transportation device of the electronic cigarette according to the embodiment of the present invention;

FIG. 5A is a schematic exploded view illustrating the fluid transportation device of FIG. 4 and taken along a front side;

FIG. 5B is a schematic exploded view illustrating the fluid transportation device of FIG. 4 and taken along a rear side;

FIG. 6A is a schematic perspective view illustrating the valve body of the fluid transportation device of FIG. 4 and taken along the front side;

FIG. 6B is a schematic perspective view illustrating the valve body of the fluid transportation device of FIG. 4 and taken along the rear side;

FIG. 7A is a schematic perspective view illustrating the valve chamber seat of the fluid transportation device of FIG. 4 and taken along the front side;

FIG. 7B is a schematic perspective view illustrating the valve chamber seat of the fluid transportation device of FIG. 4 and taken along the rear side;

FIG. 8 is a schematic top view illustrating the valve membrane of the fluid transportation device of FIG. 4;

FIG. 9 is a schematic perspective view illustrating the outer sleeve of the fluid transportation device of FIG. 4;

FIG. 10A is a schematic perspective view illustrating the valve cover of the fluid transportation device of FIG. 4 and taken along the front side;

FIG. 10B is a schematic perspective view illustrating the valve cover of the fluid transportation device of FIG. 4 and taken along the rear side;

FIG. 11 is a schematic cross-sectional view illustrating the assembled structure of the fluid transportation device of FIG. 4;

FIG. 12A is a schematic view illustrating the operations of the fluid transportation device in a first situation; and

FIG. 12B is a schematic view illustrating the operations of the fluid transportation device in a second situation.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention will now be described more specifically with reference to the following embodiments. It is to be noted that the following descriptions of preferred embodiments of this invention are presented herein for purpose of illustration and description only. It is not intended to be exhaustive or to be limited to the precise form disclosed.

As shown in FIGS. 2A, 2B and 2C, the electronic cigarette of the present invention comprises a casing 1, a power supply device 2, a sensing unit 3, an atomizer 4, a liquid storage structure 5, a fluid transportation device 6 and a mouthpiece 9. The casing 1 is a combination of a first casing 1 a and a second casing 1 b. The second casing 1 b is replaceable. The first casing 1 a and the second casing 1 b are thin-wall metal pipes, e.g., stainless steel pipes. After the first casing 1 a and the second casing 1 b are combined together, the electronic cigarette is assembled. The length and diameter of the electronic cigarette are similar to those of the conventional tobacco cigarette. The power supply device 2 and the sensing unit 3 are disposed within the first casing 1 a. The first casing 1 a comprises at least one entrance 1 c near the sensing unit 3.

As shown in FIG. 3, the power supply device 2 comprises a power module 21, a control module 22, a heater module 23 and a light emitting diode 24. The power module 21 is a rechargeable battery or a disposable battery for providing a driving power to the control module 22, the heater module 23 and the sensing unit 3. The control module 22 transmits a first control signal to the heater module 23 and a second control signal to the fluid transportation device 6. The control module 22 provides the driving power to the fluid transportation device 6, and the heater module 23 provides electric energy to the atomizer 4 for heating to atomize. The light emitting diode 24 is located at an end of the first casing 1 a. Under control of the control module 22, the light emitting diode 24 is turned on or turned off to provide a prompt signal to indicate the operating condition of the electronic cigarette or provide a prompt signal with varied intensity to indicate the intensity of the atomized vapor.

Please refer to FIGS. 2A, 2B and 2C again. The sensing unit 3 is disposed on an end of the power supply device 2, and an airflow chamber 1 d is formed between the sensing unit 3 and the power supply device 2. After the ambient airflow is introduced into the airflow chamber 1 d through the at least one entrance 1 c, the airflow passes through the sensing unit 3 along an airflow path. In an embodiment, the sensing unit 3 includes an airflow sensor 31 and an air pressure sensor 32. The airflow sensor 31 is operable to generate and transmit a control signal to the control module 22. According to the result of detecting the airflow, the electric circuit of the power supply device 2 is selectively enabled or disabled. That is, the driving power and the control signal of the control module 22 and the driving power of the heater module 23 are selectively enabled or disabled. The air pressure sensor 32 is operable to generate and transmit a detection signal to the control module 22 according to the result of detecting the pressure of the airflow. According to the detection signal, the control module 22 adjusts the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid. That is, the control signal from the control module 22 is adjusted according to the detection signal. Since the driving frequency of the fluid transportation device 6 and the driving power of the heater module 23 are correspondingly changed according to the control signal, the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid are adjusted. Moreover, an intake-and-electric-connection element 10 is disposed between the atomizer 4 and the sensing unit 3. The power supply device 2 is electrically connected with the atomizer 4 and the fluid transportation device 6 through the intake-and-electric-connection element 10. The intake-and-electric-connection element 10 also provides an airflow channel for the sensing unit 3 to communicate with the second casing 1 b.

Please refer to FIGS. 2A, 2C and 2D. The atomizer 4 is disposed within the second casing 1 b. The atomizer 4 is fixed and supported on a fixing seat 71 of a bracket 7. The atomizer 4 comprises an electric heater 41 and a liquid receiving part 42. The electric heater 41 has a hollow structure. The two pins (not shown) of the electric heater 41 are electrically connected with the power supply device 2 and the sensing unit 3 through the intake-and-electric-connection element 10. According to the flowing condition of the airflow detected by the sensing unit 3, the electric heater 41 is controlled to start heating or stop heating. In an embodiment, the liquid receiving part 42 is a tubular core used for guiding the cigarette liquid. For example, the liquid receiving part 42 is made of ceramic fiber, quartz fiber, glass fiber, aramid fiber, ordinary fiber, paper, fabric or non-woven material. The liquid receiving part 42 is disposed on the fixing seat 71. The electric heater 41 surrounds the liquid receiving part 42. Moreover, the fixing seat 71 has a gas channel 72. And, as shown in FIG. 2E, in another embodiment, the atomizer 4 comprises plural liquid receiving parts 42. The plural liquid receiving parts 42 are bundled together. The electric heater 41 surrounds the plural liquid receiving parts 42.

Please refer to FIGS. 2A and 2C. The liquid storage structure 5 is disposed within the second casing lb. The liquid storage structure 5 comprises a passageway 51 and a liquid container 52. The passageway 51 is formed within the liquid storage structure 5 for allowing the gas to pass through. The cigarette liquid is stored in the liquid container 52. Moreover, the liquid container 52 is in communication with an input channel 6 a of the fluid transportation device 6. In accordance with a feature of the present invention, the fluid transportation device 6 is used as a switch element for selectively allowing the cigarette liquid of the liquid container 52 to pass through. The fluid transportation device 6 is supported and positioned in the second casing 1 b through a supporting seat 1 e. The supporting seat 1 e has a gas channel 1 f. An output channel 6 b of the fluid transportation device 6 is in communication with the liquid receiving part 42 of the atomizer 4. When the fluid transportation device 6 is enabled, the cigarette liquid is transferred from the liquid container 52 to the liquid receiving part 42 of the atomizer 4 through the fluid transportation device 6. Meanwhile, the cigarette liquid in the liquid receiving part 42 is heated and atomized by the electric heater 41. Moreover, the passageway 51 of the liquid storage structure 5 is in communication with the intake-and-electric-connection element 10 through the gas channel 72 of the fixing seat 71 and the gas channel 1 f of the supporting seat 1 e. After the ambient airflow is fed into the at least one entrance 1 c, the airflow is transferred to the passageway 51 of the liquid storage structure 5 through the sensing unit 3 and the electric heater 41 of the atomizer 4.

Please refer to FIGS. 4, 5A, 5B, 6A, 6B, 7A and 7B. The fluid transportation device 6 comprises a valve body 63, a valve membrane 64, a valve chamber seat 65, an actuator 66 and an outer sleeve 67. After the valve body 63, the valve membrane 64, the valve chamber seat 65 and the actuator 66 are sequentially stacked on each other, the combination of the valve body 63, the valve membrane 64, the valve chamber seat 65 and the actuator 66 is accommodated within the outer sleeve 67 and assembled with the outer sleeve 67.

The valve body 63 and the valve chamber seat 65 are the main components for guiding the cigarette liquid to be inputted into or outputted from of the fluid transportation device 6. The valve body 63 comprises an inlet passage 631 and an outlet passage 632. The inlet passage 631 and the outlet passage 632 run through a first surface 633 and a second surface 634 of the valve body 63. An inlet opening 6311 is formed in the second surface 634 and in communication with the inlet passage 631. Moreover, a groove 6341 is formed in the second surface 634 and arranged around the inlet opening 6311. A protrusion block 6343 is disposed on the periphery of the inlet opening 6311. An outlet opening 6321 is formed in the second surface 634 and in communication with the outlet passage 632. A groove 6342 is arranged around the outlet opening 6321. Moreover, plural recesses 63 b are formed in the second surface 634 of the valve body 63.

The valve chamber seat 65 comprises a third surface 655, a fourth surface 656, plural posts 65 a, an inlet valve channel 651, an outlet valve channel 652 and a pressure chamber 657. The plural posts 65 a are formed on the third surface 655. The posts 65 a are aligned with the corresponding recesses 63 b of the valve body 63. When the posts 65 a are inserted into the corresponding recesses 63 b of the valve body 63, the valve body 63 and the valve chamber seat 65 are fixed together. The inlet valve channel 651 and the outlet valve channel 652 run through the third surface 655 and the fourth surface 656. A groove 653 is formed in the third surface 655 and arranged around the inlet valve channel 651. A protrusion block 6521 is disposed on the periphery of the outlet valve channel 652. A groove 654 is formed in the third surface 655 and arranged around the outlet valve channel 652. The pressure chamber 657 is concavely formed in the fourth surface 656, and in communication with the inlet valve channel 651 and the outlet valve channel 652. Moreover, a concave structure 658 is formed in the fourth surface 656 and arranged around the pressure chamber 657.

Please refer to FIGS. 5A, 5B and 8. In an embodiment, the valve membrane 64 is made of polyimide (PI), and the valve membrane 64 is produced by a reactive ion etching (RIE) process, in which a photosensitive photoresist is applied to the valve structure and the pattern of the valve structure is exposed to light, then the polyimide layer uncovered by the photoresist is etched so that the valve structure of the valve membrane 64 is formed. The valve membrane 64 is a flat thin film structure. As shown in FIG. 8, the valve membrane 64 comprises two valve plates 641 a and 641 b at two perforated regions 64 a and 64 b, respectively. The two valve plates 641 a and 641 b have the same thickness. The valve membrane 64 further comprises plural extension parts 642 a and 642 b. The extension parts 642 a and 642 b are arranged around the valve plates 641 a and 641 b for elastically supporting the valve plates 641 a and 641 b. The valve membrane 64 further comprises plural hollow parts 643 a and 643 b, each of which is formed between two adjacent extension parts 642 a and 642 b. When an external force is exerted on any one of the valve plates 641 a and 641 b, the valve plates 641 a and 641 b are subjected to a displacement since the valve plates 641 a and 641 b are elastically supported by the extension parts 642 a and 642 b. Consequently, a valve structure is formed. Preferably but not exclusively, the valve plates 641 a and 641 b have circular shapes, rectangular shapes, square shapes or arbitrary shapes. The valve membrane 64 further comprises plural positioning holes 64 c. The posts 65 a of the valve chamber seat 65 are penetrated through the corresponding positioning holes 64 c. Consequently, the valve membrane 64 is positioned on the valve chamber seat 65. Meanwhile, the inlet valve channel 651 and the outlet valve channel 652 are respectively covered by the valve plates 641 a and 641 b (see FIG. 8). In this embodiment, the valve chamber seat 65 comprises two posts 65 a and valve membrane 64 comprises two positioning holes 64 c. It is noted that the number of the posts 65 a and the number of the positioning holes 64 c are not restricted.

Please refer to FIG. 11. When the valve body 63 and the valve chamber seat 65 are combined together, four sealing rings 68 a, 68 b, 68 c and 68 d are received in the groove 6341 of the valve body 63, the groove 6342 of the valve body 63, the groove 653 of the valve chamber seat 65 and the groove 654 of the valve chamber seat 65, respectively. Due to the sealing rings 68 a, 68 b, 68 c and 68 d, the cigarette liquid is not leaked out after the valve body 63 and the valve chamber seat 65 are combined together. The inlet passage 631 of the valve body 63 is aligned with the inlet valve channel 651 of the valve chamber seat 65. The communication between the inlet passage 631 and the inlet valve channel 651 is selectively enabled or disabled through the valve plate 641 a of the valve membrane 64. The outlet passage 632 of the valve body 63 is aligned with the outlet valve channel 652 of the valve chamber seat 65. The communication between the outlet passage 632 and the outlet valve channel 652 is selectively enabled or disabled through the valve plate 641 b of the valve membrane 64. When the valve plate 641 a of the valve membrane 64 is opened, the cigarette liquid is transferred from the inlet passage 631 to the pressure chamber 657 through the inlet valve channel 651. When the valve plate 641 b of the valve membrane 64 is opened, the cigarette liquid is transferred from the pressure chamber 657 to the outlet passage 632 through the outlet valve channel 652. Finally, the cigarette liquid is expelled from the outlet passage 632.

Please refer to FIGS. 5A and 5B again. The actuator 66 comprises a vibration plate 661 and a piezoelectric element 662. The piezoelectric element 662 is attached on a surface of the vibration plate 661. In an embodiment, the vibration plate 661 is made of a metallic material, and the piezoelectric element 662 is made of a highly-piezoelectric material such as lead zirconate titanate (PZT) piezoelectric powder. When a voltage is applied to the piezoelectric element 662, the piezoelectric element 662 is subjected to a deformation. Consequently, the vibration plate 661 is vibrated along the vertical direction in the reciprocating manner to drive the operation of the fluid transportation device 6. In this embodiment, the vibration plate 661 of the actuator 66 is assembled with the fourth surface 656 of the valve chamber seat 65 to cover the pressure chamber 657. As mentioned above, the concave structure 658 is formed in the fourth surface 656 and arranged around the pressure chamber 657. For preventing from the fluid leakage, a sealing ring 68 e is received in the concave structure 658.

As mentioned above, the valve body 63, the valve membrane 64, the valve chamber seat 65 and the actuator 66 are the main components of the fluid transportation device 6 for guiding the cigarette liquid. In accordance with the feature of the present invention, the fluid transportation device 6 has a specified mechanism for assembling and positioning these components. That is, it is not necessary to use the fastening elements (e.g., screws, nuts or bolts) to fasten these components. In an embodiment, the valve body 63, the valve membrane 64, the valve chamber seat 65 and the actuator 66 are sequentially stacked on each other and accommodated within the outer sleeve 67. Then, a valve cover 62 is tight-fitted into the outer sleeve 67. Consequently, the fluid transportation device 6 is assembled. The mechanism for assembling and positioning these components will be described as follows.

Please refer to FIGS. 5A, 5B and 9. The outer sleeve 67 is made of a metallic material. An accommodation space is defined by an inner wall 671 of the outer sleeve 67. Moreover, a ring-shaped protrusion structure 672 is formed on the lower portion of the inner wall 671 of the outer sleeve 67. Then, please refer to FIGS. 10A and 10B. The valve cover 62 is also made of a metallic material. The valve cover 62 comprises a first opening 621 and a second opening 622. The inlet passage 631 and the outlet passage 632 of the valve body 63 are penetrated through the first opening 621 and the second opening 622, respectively. Moreover, a bottom edge of the valve cover 62 has a chamfer structure 623. The outer diameter of the valve cover 62 is slightly larger than the inner diameter of the inner wall 671 of the outer sleeve 67.

Please refer to FIGS. 5A and 5B again. The valve body 63, the valve membrane 64, the valve chamber seat 65 and the actuator 66 are sequentially stacked on each other and placed into the accommodation space within the inner wall 671 of the outer sleeve 67. Meanwhile, the combination of the valve body 63, the valve membrane 64, the valve chamber seat 65 and the actuator 66 is supported by the ring-shaped protrusion structure 672 of the outer sleeve 67. As mentioned above, the outer diameter of the valve cover 62 is slightly larger than the inner diameter of the inner wall 671 of the outer sleeve 67. Due to the chamfer structure 623, the valve cover 62 is tight-fitted into the outer sleeve 67. Consequently, the combination of the valve body 63, the valve membrane 64, the valve chamber seat 65 and the actuator 66 is securely fixed between the valve cover 62 and the outer sleeve 67. Meanwhile, the fluid transportation device 6 is assembled. In this embodiment, the actuator 66 is also disposed within the accommodation space of the outer sleeve 67. When piezoelectric element 662 is subjected to a deformation in response to the applied voltage, the vibration plate 661 is vibrated along the vertical direction in the reciprocating manner. In other words, it is not necessary to use the fastening elements (e.g., screws, nuts or bolts) to fasten the components of the fluid transportation device 6.

Please refer to FIG. 11 again. The inlet valve channel 651 of the valve chamber seat 65 is aligned with the inlet opening 6311 of the valve body 63, and the inlet valve channel 651 of the valve chamber seat 65 and the inlet opening 6311 of the valve body 63 are selectively in communication with each other through the valve plate 641 a of the valve membrane 64. When the inlet opening 6311 of the valve body 63 is closed by the valve plate 641 a, the valve plate 641 a is in close contact with the protrusion block 6343 of the valve body 63. Consequently, a pre-force is generated to result in a stronger sealing effect, and the cigarette liquid will not be returned back. Similarly, the outlet valve channel 652 of the valve chamber seat 65 is aligned with the outlet opening 6321 of the valve body 63, and the outlet valve channel 652 of the valve chamber seat 65 and the outlet opening 6321 of the valve body 63 are selectively in communication with each other through the valve plate 641 b of the valve membrane 64. When the outlet valve channel 652 of the valve chamber seat 65 is closed by the valve plate 641 b, the valve plate 641 b is in close contact with the protrusion block 6521 of the valve chamber seat 65. Consequently, a pre-force is generated to result in a stronger sealing effect, and the cigarette liquid will not be returned back to the pressure chamber 657. Under this circumstance, in case that the fluid transportation device 6 is disabled, the cigarette liquid is not returned back to the inlet passage 631 and the outlet passage 632 of the valve body 63.

The operations of the fluid transportation device 6 will be described in more details as follows. As shown in FIG. 12A, when the piezoelectric element 662 of the actuator 66 is subjected to a deformation in response to the applied voltage and causes downwardly deformation of the vibration plate 661, the volume of the pressure chamber 657 is expanded to result in suction. In response to the suction, the valve plate 641 a of the valve membrane 64 is quickly opened. Consequently, a great amount of the cigarette liquid is inhaled into the inlet passage 631 of the valve body 63, transferred to and temporarily stored in the pressure chamber 657 through the inlet opening 6311 of the valve body 63, the hollow parts 643 a of the valve membrane 64 and the inlet valve channel 651 of the valve chamber seat 65. Since the suction is also exerted on the outlet valve channel 652, the valve plate 641 b supported by the extension parts 642 b of the valve membrane 64 is in close contact with the protrusion block 6521 of the valve chamber seat 65. Consequently, the outlet valve channel 652 of the valve chamber seat 65 is tightly closed by the valve plate 641 b.

Then, as shown in FIG. 12B, once the direction of electric field applied to the piezoelectric element 662 is changed, the piezoelectric element 662 drives the vibration plate 661 to deform upwardly, and the volume of the pressure chamber 657 is shrunken. As a result, the cigarette liquid within the pressure chamber 657 is compressed, and a pushing force is applied to the inlet valve channel 651. In response to the pushing force, the valve plate 641 a supported by the extension parts 642 a of the valve membrane 64 is in close contact with the protrusion block 6343 of the valve body 63. Consequently, the inlet valve channel 651 of the valve chamber seat 65 is closed, and the cigarette liquid cannot be returned back to the inlet valve channel 651. Meanwhile, the pushing force is also applied to the outlet valve channel 652. In response to the pushing force, the valve plate 641 b supported by the extension parts 642 b of the valve membrane 64 is separated from the protrusion block 6521. Meanwhile, the outlet valve channel 652 of the valve chamber seat 65 is opened, and the cigarette liquid is transferred from the pressure chamber 657 to the external portion of the fluid transportation device 6 through the outlet valve channel 652 of the valve chamber seat 65, the hollow parts 643 b of the valve membrane 64, the outlet opening 6321 of the valve body 63 and the outlet passage 632 of the valve body 63, sequentially.

The processes of FIGS. 12A and 12B are repeatedly done. Consequently, the cigarette liquid can be transferred by the fluid transportation device 6 at high efficiency without being returned back.

The fluid transportation device 6 is disposed between the sensing unit 3 and the atomizer 4. The inlet passage 631 and the input channel 6 a of the fluid transportation device 6 are connected with each other. The fluid transportation device 6 is in communication with the liquid container 52 through the input channel 6 a. The outlet passage 632 and the output channel 6 b of the fluid transportation device 6 are connected with each other. The output channel 6 b of the fluid transportation device 6 is in communication with the liquid receiving part 42 of the atomizer 4. When the fluid transportation device 6 is enabled, the cigarette liquid can be transferred from the liquid container 52 to the liquid receiving part 42. In response to the control signal from the control module 22, the fluid transportation device 6 is enabled. Since the fluid transportation device 6 is used as a switch element, the cigarette liquid is transferred from the liquid container 52 to the liquid receiving part 42 through the fluid transportation device 6 at a certain amount. Under the same pressure, the cigarette liquid is uniformly transferred to the liquid receiving part 42 to generate uniform droplets. Once the cigarette liquid absorbed by the liquid receiving part 42 reaches a saturation state, the fluid transportation device 6 is disabled. In other words, the cooperation of the fluid transportation device 6 and the atomizer 4 forms a controllable switch element in order for precisely controlling the amount of the cigarette liquid to be transferred to the liquid receiving part 42 of the atomizer 4. Consequently, the taste of the atomized vapor is enhanced, and the liquid leakage problem is solved.

Please refer to FIGS. 2A and 2C. The mouthpiece 9 is located at an end of the second casing 1 b. Moreover, the mouthpiece 9 is in communication with the passageway 51 of the liquid storage structure 5. The mouthpiece 9 comprises a filter 91 and an opening 92. The filter 91 is located at an end of the passageway 51 of the liquid storage structure 5 to block the cigarette liquid which is not completely atomized from entering the opening 92. Consequently, the cigarette liquid cannot be inhaled by the user.

The operations of the electronic cigarette will be described as follows. When the user smokes and inhales the air through the opening 92 of the mouthpiece 9, the airflow flows through the electronic cigarette. At the same time, the electric circuit of the power supply device 2 is enabled. After the electric circuit of the power supply device 2 is enabled, the power supply device 2 provides electric power to the heater module 23. Consequently, the electric heater 41 is enabled to heat the cigarette liquid. Meanwhile, the cigarette liquid in the liquid receiving part 42 is heated and atomized by the electric heater 41. The cooperation of the fluid transportation device 6 and the atomizer 4 forms a controllable switch element in order for precisely controlling the amount of the cigarette liquid to be transferred to the liquid receiving part 42 of the atomizer 4 at a certain amount. Consequently, the user inhales the atomized vapor from the passageway 51 of the liquid storage structure 5 through the opening 92 of the mouthpiece 9. When the user stops smoking, the airflow does not flow through the electronic cigarette. According to the sensing result of the sensing unit 3, the electric circuit of the power supply device 2 is disabled. Meanwhile, the electric heater 41 is disabled.

Moreover, when the user inhales the atomized vapor through the opening 92 of the mouthpiece 9, the air pressure sensor 32 generates and transmits a detection signal to the control module 22 according to the result of detecting the pressure of the airflow. According to the detection signal, the control module 22 adjusts the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid. That is, the control signal from the control module 22 is adjusted according to the detection signal. Since the driving frequency of the fluid transportation device 6 and the driving power of the heater module 23 are correspondingly changed according to the control signal, the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid are adjusted. Consequently, the user could inhale a great amount of atomized vapor quickly, or the user could inhale the same amount of atomized vapor in each breath.

From the above descriptions, the present invention provides the electronic cigarette. The cooperation of the fluid transportation device and the liquid receiving part of the atomizer forms the controllable switch element. The amount of the cigarette liquid to be transferred to the liquid receiving part of the atomizer is precisely controlled by the controllable switch element. The electronic cigarette includes an airflow sensor and an air pressure sensor. The air pressure sensor generates and transmits a detection signal to the control module according to the result of detecting the pressure of the airflow. According to the detection signal, a control module adjusts the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid. That is, the control signal from the control module is adjusted according to the detection signal. Since the driving frequency of the fluid transportation device and the driving power of the heater module are correspondingly changed according to the control signal, the speed of atomizing the cigarette liquid and the speed of providing the cigarette liquid are adjusted. Consequently, the cigarette liquid can be transferred by the fluid transportation device at high efficiency without being returned back. Since the amount of the cigarette liquid is precisely controlled, the droplets are uniformly generated, the taste of the atomized vapor is enhanced, and the liquid leakage problem is solved. In other words, the electronic cigarette with the fluid transportation device is industrially valuable.

While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures. 

What is claimed is:
 1. An electronic cigarette, comprising: a power supply device providing a driving power and a control signal; a sensing unit, wherein an electric circuit of the power supply device is selectively enabled or disabled according to a result of detecting an airflow by the sensing unit; an atomizer comprising an electric heater and at least one liquid receiving part, wherein the electric heater surrounds the liquid receiving part; a liquid storage structure comprising a passageway and a liquid container, wherein the passageway allows the airflow to go through, the electric heater of the atomizer is disposed on a first end of the passageway, and a cigarette liquid is stored in the liquid container; a fluid transportation device comprising an input channel and an output channel, wherein the input channel is in communication with the liquid container, the output channel is in communication with the liquid receiving part of the atomizer, wherein the cigarette liquid is transferred from the liquid container to the liquid receiving part through the fluid transportation device, so that the cigarette liquid is transferred to the electric heater of the atomizer at a certain amount, wherein after the cigarette liquid is heated by the electric heater, an atomized vapor is generated; a casing, wherein the power supply device, the sensing unit, the fluid transportation device, the atomizer, the liquid storage structure and an intake-and-electric-connection element are disposed within the casing, and the casing has an entrance for the airflow to pass through, wherein after the airflow is fed into the entrance, the airflow passes through the sensing unit and the passageway of the liquid storage structure along an airflow path, wherein the fluid transportation device and the electric heater of the atomizer are electrically connected with the power supply device and the sensing unit through the intake-and-electric-connection element to receive the driving power and the control signal; and a mouthpiece sealing an end of the casing and in communication with the passageway of the liquid storage structure, wherein the mouthpiece has an opening for inhaling the atomized vapor in the passageway of the liquid storage structure.
 2. The electronic cigarette according to claim 1, wherein the casing is a combination of a first casing and a second casing, wherein the power supply device and the sensing unit are disposed within the first casing, and the fluid transportation device, the atomizer and the liquid storage structure are disposed within the second casing.
 3. The electronic cigarette according to claim 1, wherein the power supply device comprises a power module, a control module, a heater module and a light emitting diode.
 4. The electronic cigarette according to claim 3, wherein the power module of the power supply device is a rechargeable battery for providing the driving power to the control module, the heater module, the sensing unit and the fluid transportation device.
 5. The electronic cigarette according to claim 3, wherein the power module of the power supply device is a disposable battery for providing the driving power to the control module, the heater module, the sensing unit and the fluid transportation device.
 6. The electronic cigarette according to claim 3, wherein the control module of the power supply device is operable to transmit a first control signal to the heater module and a second control signal to the fluid transportation device, and the control module provides the driving power to the fluid transportation device.
 7. The electronic cigarette according to claim 3, wherein the heater module of the power supply device provides electric energy to the electric heater of the atomizer.
 8. The electronic cigarette according to claim 3, wherein the light emitting diode of the power supply device is located at an end of the casing, wherein under control of the control module, the light emitting diode is turned on or turned off to provide a prompt signal to indicate an operating condition of the electronic cigarette.
 9. The electronic cigarette according to claim 3, wherein the light emitting diode of the power supply device is located at an end of the casing, wherein under control of the control module, the light emitting diode provides a prompt signal to indicate an intensity of the atomized vapor.
 10. The electronic cigarette according to claim 3, wherein the sensing unit includes an airflow sensor and an air pressure sensor, wherein the electric circuit of the power supply device is selectively enabled or disabled according to the result of detecting the airflow by the airflow sensor, and the air pressure sensor is operable to generate and transmit a detection signal to the control module according to a result of detecting a pressure of the airflow, wherein according to the detection signal, the control module adjusts a speed of atomizing the cigarette liquid and a speed of providing the cigarette liquid.
 11. The electronic cigarette according to claim 1, wherein the liquid receiving part is a tubular core for guiding the cigarette liquid, and the tubular core is made of ceramic fiber, quartz fiber, glass fiber, aramid fiber, ordinary fiber, paper, fabric or non-woven material.
 12. The electronic cigarette according to claim 1, wherein the at least one liquid receiving part comprises plural liquid receiving parts, wherein the plural liquid receiving parts are bundled together, and the electric heater surrounds the plural liquid receiving parts.
 13. The electronic cigarette according to claim 1, wherein the mouthpiece further comprises a filter located at a second end of the passageway of the liquid storage structure, wherein the cigarette liquid not atomized is stopped by the filter.
 14. The electronic cigarette according to claim 1, wherein the fluid transportation device comprises: a valve cover comprising a first opening and a second opening; a valve body comprising an inlet passage, an outlet passage, a first surface and a second surface, wherein the inlet passage and the outlet passage run through the first surface and the second surface, an inlet opening is formed in the second surface and in communication with the inlet passage, an outlet opening is formed in the second surface and in communication with the outlet passage; a valve membrane comprising two valve plates, plural extension parts and plural hollow parts, wherein the two valve plates have the same thickness, the plural extension parts are arranged around the valve plates for elastically supporting the valve plates, and the hollow parts are arranged between the extension parts; a valve chamber seat comprising a third surface, a fourth surface, an inlet valve channel, an outlet valve channel and a pressure chamber, wherein the inlet valve channel and the outlet valve channel run through the third surface and the fourth surface, the two valve plates are supported on the inlet valve channel and the outlet valve channel, the pressure chamber is concavely formed in the fourth surface, and the pressure chamber is in communication with the inlet valve channel and the outlet valve channel; an actuator, wherein the pressure chamber of the valve chamber seat is covered by the actuator; and an outer sleeve, wherein an accommodation space is defined by an inner wall of the outer sleeve, and a ring-shaped protrusion structure is formed on the inner wall of the outer sleeve, wherein the valve body, the valve membrane, the valve chamber seat and the actuator are sequentially stacked on each other, accommodated within the accommodation space of the outer sleeve, and supported on the ring-shaped protrusion structure, wherein the inlet passage and the outlet passage of the valve body are respectively penetrated through the first opening and the second opening of the valve cover, wherein while the actuator is enabled, the cigarette liquid is fed into the inlet passage and outputted from the outlet passage.
 15. The electronic cigarette according to claim 14, wherein plural recesses are formed in the second surface of the valve body, and plural posts are formed on the third surface of the valve chamber seat, wherein the plural posts are inserted into the corresponding recesses, so that the valve chamber seat is fixed on the valve body.
 16. The electronic cigarette according to claim 15, wherein the valve membrane is disposed between the valve body and the valve chamber seat, and the valve membrane comprises plural positioning holes corresponding to the plural posts, wherein the plural posts are penetrated through the corresponding positioning holes, so that the valve membrane is positioned and supported on the valve chamber seat.
 17. The electronic cigarette according to claim 14, wherein a first groove is formed in the second surface and arranged around the inlet opening, a second groove is formed in the second surface and arranged around the outlet opening, a third groove is formed in the third surface and arranged around the inlet valve channel, and a fourth groove is formed in the third surface and arranged around the outlet valve channel, wherein the fluid transportation device further comprises plural sealing rings, and the plural sealing rings are received in the first groove, the second groove, the third groove and the fourth groove, respectively.
 18. The electronic cigarette according to claim 14, wherein a first protrusion block is formed on the second surface of the valve body and disposed on a periphery of the inlet opening, and a second protrusion block is formed on the third surface and disposed on a periphery of the outlet valve channel, wherein the first protrusion block and the second protrusion block are cooperated with the two valve plates respectively to form pre-forces for sealing and preventing the cigarette liquid from returning back.
 19. The electronic cigarette according to claim 14, wherein the actuator comprises a vibration plate and a piezoelectric element, wherein the piezoelectric element is attached on a surface of the vibration plate, the piezoelectric element is subjected to a deformation in response to an applied voltage, and the vibration plate of the actuator is assembled with the fourth surface of the valve chamber seat to cover the pressure chamber. 